13. Which of the following sets is a function? А. ((3, 1), (3, 2), (3,5)} B. {(-1,–1), (–2, 7), (–1,3)} NOPE С. ((-6, 1), (4, 7), (-6, 3)} D. {(9,0), (8, 1), (7, 2)}

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### Question 13: Functions in Set Theory

**Question:**  
Which of the following sets is a function?

**Options:**

- **A.** \(\{(3, 1), (3, 2), (3, 5)\}\)   
- **B.** \(\{(-1, -1), (-2, 7), (-1, 3)\}\)   
- **C.** \(\{(-6, 1), (4, 7), (-6, 3)\}\)   
- **D.** \(\{(9, 0), (8, 1), (7, 2)\}\)

**Explanation:**

A function from a set \(A\) to a set \(B\) is a relation where each element in set \(A\) is associated with exactly one element in set \(B\). In other words, no two pairs in the relation should have the same first element unless they map to the same second element.

- **Option A:** The set \(\{(3, 1), (3, 2), (3, 5)\}\) is not a function because the element '3' in the domain (first element of ordered pairs) is associated with more than one element in the codomain (second element of ordered pairs): 1, 2, and 5.

- **Option B:** The set \(\{(-1, -1), (-2, 7), (-1, 3)\}\) is not a function because the element '-1' in the domain is associated with two elements in the codomain: -1 and 3. This violates the definition of a function. (The text "NOPE" is written in red ink next to this option indicating it is incorrect.)

- **Option C:** The set \(\{(-6, 1), (4, 7), (-6, 3)\}\) is not a function because the element '-6' in the domain is associated with two elements in the codomain: 1 and 3.

- **Option D:** The set \(\{(9, 0), (8, 1), (7, 2)\}\) is a function because each element in the domain (9, 8, 7) is associated with exactly one unique element in the codomain (0, 1
Transcribed Image Text:### Question 13: Functions in Set Theory **Question:** Which of the following sets is a function? **Options:** - **A.** \(\{(3, 1), (3, 2), (3, 5)\}\) - **B.** \(\{(-1, -1), (-2, 7), (-1, 3)\}\) - **C.** \(\{(-6, 1), (4, 7), (-6, 3)\}\) - **D.** \(\{(9, 0), (8, 1), (7, 2)\}\) **Explanation:** A function from a set \(A\) to a set \(B\) is a relation where each element in set \(A\) is associated with exactly one element in set \(B\). In other words, no two pairs in the relation should have the same first element unless they map to the same second element. - **Option A:** The set \(\{(3, 1), (3, 2), (3, 5)\}\) is not a function because the element '3' in the domain (first element of ordered pairs) is associated with more than one element in the codomain (second element of ordered pairs): 1, 2, and 5. - **Option B:** The set \(\{(-1, -1), (-2, 7), (-1, 3)\}\) is not a function because the element '-1' in the domain is associated with two elements in the codomain: -1 and 3. This violates the definition of a function. (The text "NOPE" is written in red ink next to this option indicating it is incorrect.) - **Option C:** The set \(\{(-6, 1), (4, 7), (-6, 3)\}\) is not a function because the element '-6' in the domain is associated with two elements in the codomain: 1 and 3. - **Option D:** The set \(\{(9, 0), (8, 1), (7, 2)\}\) is a function because each element in the domain (9, 8, 7) is associated with exactly one unique element in the codomain (0, 1
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